Getting the size of an array in an object

Question

I would like some help with getting the size of an array inside an object:

var st = { "itema":{...},"itemb":[{"id":"s01","cd":"c01","dd":"d01",....}{"id":"s02","cd":"c02","dd":"d02",....}]}

How would you get a count of the objects inside "itemb" (in this case 2)?

Jonathan Leffler · Accepted Answer · 2011-07-09 05:29:13Z

87

Javascript arrays have a length property. Use it like this:

st.itemb.length

edited Jul 9, 2011 at 5:29

Jonathan Leffler

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answered May 2, 2011 at 19:31

Andrew Hare

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1 Comment

Dan Manastireanu Over a year ago

That should be st.itemb.length

Jamie Treworgy · Accepted Answer · 2011-05-02 19:34:06Z

19

Arrays have a property .length that returns the number of elements.

var st =
    {
        "itema":{},
        "itemb":
        [
            {"id":"s01","cd":"c01","dd":"d01"},
            {"id":"s02","cd":"c02","dd":"d02"}
        ]
    };

st.itemb.length // 2

edited May 2, 2011 at 19:34

Jamie Treworgy

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answered May 2, 2011 at 19:33

BrunoLM

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